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The man accused of killing Jennifer Hudson's mother, brother and 7-year-old nephew repeatedly threatened to kill his estranged wife's family during a "rant" about how she was seeing someone else, a witness testified Thursday. (Published Thursday, Apr 26, 2012)

Updated at 10:59 PM EDT on Thursday, Apr 26, 2012

The man accused of killing Jennifer Hudson's mother, brother and 7-year-old nephew repeatedly threatened to kill his estranged wife's family during a "rant" about how she was seeing someone else, a witness testified Thursday.

Robbin Myers' told the court that William Balfour attended a birthday party at his home in August 2008 and "went on a rant'" about how he suspected his wife, Julia Hudson, was seeing a co-worker. Myers' wife was friendly with Julia Hudson.

PHOTOS: William Balfour's Trial Jury

Balfour, 30, Jennifer Hudson's former brother-in-law and is accused of killing her mother, Darnell Donnerson; her brother, Jason Hudson, and her nephew, Julian King. He's pleaded not guilty.

Myers testified that during their conversation, Balfour threatened to kill the Hudson family "at least
10 times." He said Balfour raised his arms, exposing a handgun in his waistband.

Myers also testified he saw Balfour in a car outside the bus company where Julia Hudson and Myers' wife worked days before the slayings. He said Balfour got out of the car with a gun in his waistband and headed for the building, but stopped when Myers honked a car horn.

Thursday's proceedings also included testimony from Balfour's ex-girlfriend.

Diana Grant told jurors that Balfour slept at her apartment the night before Hudson's family members were killed. She said she thought it was odd that she and Balfour didn't have sex and that Balfour left her her apartment at about 6 a.m. the day of the slayings.

She said she didn't know until a couple of months into her relationship with Balfour that he and Julia Hudson had been married. And though she knew Balfour was dating another woman, she continued to see him and buying him clothes.

Police said the boy was shot twice in the head inside a white SUV stolen from the Hudson family home in Englewood. Graphic photos showed bullet holes through the top of Julian's head and his white T-shirt drenched in blood.

Balfour appeared to tear up as the photographs were shown depicting how the little boy died.

The forensic pathologist who examined Julian's body described how the boy died. Mikitra Kaleka said he likely was killed the same day as Donnerson and Jason Hudson.